321 in this case.
What is it?
Also, when I shake a large flower, the petals that fall don’t wind up in their vial. What’s up with that?
321 is the amount of nectar from this flower(In this case, it’s a yellow parrot tulip).
Furthermore, swiping the big flower drops not petals, but nectar.
So how do I use that nectar? After it hits 400, it won’t allow me to collect any more. There is noo nectar or flower petals that seem to correspond to this “321” or “400”, and it won’t allow me to reduce that number. 
Hmm, have you not watched the tutorial yet?
When you feed nectar to Pikmin, you can make them bloom. Tapping these bloomed Pikmin will reward you with flower petals, which can be planted.
Wasn’t there a way to reset the tutorial? For now, we recommend watching the " A few tips for new players that are getting started on Pikmin Bloom." or checking out the beginner’s guide video.
When you whistle you will be on this screen. The white bubble at the bottom is nectar. Tap it to select your nectar. You can drag and hold a drop up to feed it to your Pikmin.
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Basically, it works like this:
- You can get flower petals by giving nectar to Pikmin and picking them.
- Giving nectar to Pikmin increases their friendship level. For location decor Pikmin, they can wear decor when their friendship level reaches
4. - As the Pikmin’s friendship level increases, their ability to work with mushrooms improves.
In any case, it would be best to learn the basic functions of this game from YouTube or other sources.